Sony NW-ZX2 Manual page 99

[Prioritize connection]
The sound quality may not be as good as in other modes, but the connection status
will most likely be stable.
This setting is recommended if the connection is unstable.
Hint
Note
[76] How to Use
Notes on the Bluetooth function
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If the sound is interrupted, select [Prioritize connection].
Changing the wireless playback quality setting of your Walkman may not have any
effect depending on the settings of the Bluetooth audio device.
Bluetooth
Bluetooth wireless technology allows connection at a distance of up to about 10
meters. However, the effective range may vary depending on obstructions (people,
metals, walls, etc.) or signal status.
The Bluetooth antenna (aerial) is built into your Walkman. You can improve the
sensitivity of Bluetooth communications by turning the built-in Bluetooth antenna
(aerial) in the direction of the connected Bluetooth device. The communication
distance shortens if there are obstructions between the connected device and the
Walkman.
The following conditions may cause noise, breakup of sound, or changes in
playback speed.
When using inside a metal bag.
Notes on the Bluetooth Function